Huntington Beach Zoning and ADU Guide for Homeowners and Sellers

Last updated November 13, 2026. Reviewed by the Cash Home Buyers CA team. Information comes from the City of Huntington Beach and the California Department of Housing and Community Development; sources are listed at the end.

Huntington Beach says its former local ADU section, HBZSO Section 230.10, is no longer in effect, because the state ADU and junior ADU laws that took effect January 1, 2020 now govern. The city reviews every ADU and JADU ministerially, which means by checklist rather than at a hearing. The one local wrinkle the city flags is the Coastal Zone, where a Coastal Development Permit may also be needed.

Huntington Beach ADU rules at a glance

How Huntington Beach handles ADUs today

For years Huntington Beach regulated backyard units through its own zoning ordinance. The city’s planning page explains that when California adopted new ADU and junior ADU laws effective January 1, 2020, that local section stopped being the controlling rule.

In practice that means a Huntington Beach owner should read two things together: the city’s ADU Handout, which lists the development standards and zoning criteria the city applies, and the state Department of Housing and Community Development ADU Handbook, which explains what a city may and may not require.

The page also records a council decision. At the March 7, 2023 City Council meeting, the council directed staff to keep accepting ADU applications, and the planning page repeats that direction. For a seller this matters in a simple way: a legal path to permit a unit exists today, and the city has said it will keep processing those applications.

The Coastal Zone caveat

Huntington Beach has a long coastline, and the city notes that ADU or JADU development in the Coastal Zone may require a Coastal Development Permit on top of the building permit.

Whether a particular lot is inside the Coastal Zone is something to confirm with the Planning Division before you assume any timeline.

If you are weighing whether to legalize a garage conversion or backyard unit before selling, the Coastal Zone question can add time, which is one reason many owners compare legalizing against selling as-is.

The city’s pre-approved ADU plan

Under state Assembly Bill 1332, Huntington Beach offers a pre-approved ADU plan that anyone may use free of charge. The plan on the city’s page is a one-story, detached unit of 490 square feet.

The city’s brochure describes the program as available in three architectural styles, California Ranch, Bungalow and Spanish Colonial, with a streamlined permit process and savings on design fees.

The brochure’s sample floor plan shows one bedroom, one bath and a combined kitchen, living and dining area, with the option of a tub or a walk-in shower and floor-mounted or foldaway grab bars for aging in place.

The city is firm on one point: modifications or deviations from the pre-approved plan are not allowed. An owner who wants a different layout has to use the standard design route instead. The brochure lists the Permit Center at (714) 536-5271 for questions.

What state law sets as the baseline

Because Huntington Beach defers to state law, the HCD Handbook (March 2026 update) is the best reference for the minimums a city must honor. These are state rules, not city-specific numbers, so check the city’s ADU Handout for anything stricter that state law allows:

• 60-day review. A complete ADU or JADU application must be approved or denied within 60 days (Gov. Code sections 66317 and 66335).
• 800 square feet protected. A city’s standards cannot prevent an ADU of at least 800 square feet (Gov. Code 66321).
• Height and setbacks. The base height limit for a detached ADU is 16 feet, with higher limits near transit or on multifamily lots, and side and rear setbacks of no more than 4 feet (Gov. Code 66321 and 66314).
• Impact fees. ADUs of 750 square feet or less are exempt from impact fees, and larger ones are charged proportionately (Gov. Code 66311.5).
• JADUs. A junior ADU is limited to 500 square feet (Gov. Code 66313).
• Owner occupancy and rentals. Owner occupancy cannot be required for an ADU (Gov. Code 66315), and cities may require rentals longer than 30 days.
• No separate sale. An ADU generally cannot be sold apart from the main home unless a local condominium-conversion ordinance or a qualifying nonprofit program applies (Gov. Code 66341 and 66342).

What if my Huntington Beach ADU or garage conversion has no permit?

California adopted a specific rule for older unpermitted units.

Under Government Code section 66311.7, added by AB 2533, a city may not deny a permit for an ADU or JADU built before January 1, 2020 because of building code violations, unless correcting the violation is necessary to protect health and safety or the unit is substandard under Health and Safety Code section 17920.3.

In plain terms, many older backyard units and garage conversions can be brought onto the record without being forced to meet every modern code, as long as they are safe.

The practical first step is a call to the Huntington Beach Permit Center at (714) 536-5271 to ask what the city would require for your address, including whether the Coastal Zone applies. Check the permit history too, using our Huntington Beach building permits guide.

The city enforces land-use rules through code enforcement; see the Huntington Beach code enforcement guide. For the statewide picture, read our guide to selling as-is with unpermitted work.

How an unpermitted unit affects a sale

California sellers must disclose known unpermitted work on the Transfer Disclosure Statement, and a buyer’s inspection or a records search may turn it up anyway.

On a traditional listing, buyers commonly respond in one of four ways: they ask you to legalize the unit before closing, ask for a price reduction, ask for a repair credit, or walk away.

Lenders and appraisers can also be cautious about living space that is missing from city records, which can shrink the pool of buyers who can finance the purchase.

A cash buyer works differently. There is no lender appraisal to satisfy, so the unit does not have to be on the city’s books for the deal to close. The buyer prices the risk and the cost of resolving it into the offer, and you decide whether that number beats the cost, time and uncertainty of fixing it yourself.

Three ways to handle an unpermitted unit before selling

1. Legalize first. Apply for permits, pass inspections and sell with the unit on record. This can raise the price a traditional buyer pays, but it costs money and time up front, and in the Coastal Zone it may involve an extra permit.
2. List with a credit. Sell on the open market and offer the buyer a credit or price reduction to handle the unit afterward. You keep control of timing but accept a smaller buyer pool.
3. Sell as-is for cash. Skip the permits, repairs and showings and take a written offer that already reflects the unit’s condition.

How to sell a house in Huntington Beach with an unpermitted ADU

1. Check city records. Look at permit records for the address and confirm what the city shows as the legal square footage and number of units.
2. Ask the Permit Center. Find out what legalizing would take and whether the lot is in the Coastal Zone.
3. Gather what you have. Collect any old plans, contractor invoices, utility records or photos that show when the unit was built. A pre-2020 build date matters under AB 2533.
4. Compare options. Weigh legalizing, selling with a credit and selling as-is against your timeline.
5. Disclose honestly. A cash offer does not change what you must disclose on the Transfer Disclosure Statement.

See selling a house as-is in Huntington Beach or our cash-offer process.

Common mistakes with backyard units and garage conversions

• Assuming the unit is legal because the previous owner said so. Verbal assurances do not show up on a permit search. Check records for the address.
• Listing the extra square footage. Advertising unpermitted space as living area can create disclosure and appraisal problems later.
• Starting repairs without asking the city. New work on an unpermitted unit may trigger the same permit requirements you were trying to avoid.
• Forgetting the Coastal Zone. A lot near the coast may need a Coastal Development Permit that an inland lot would not.
• Ignoring tenants. If someone lives in the unit, tenant rights and notice rules affect your timeline. See our tenant-occupied home sale guide.

Questions about your unit? Call (424) 435-2326 or request a cash offer. No cost, no obligation.

Huntington Beach zoning and ADU FAQ

Does Huntington Beach allow ADUs?

Yes. The city provides ministerial review for all ADUs and JADUs, and staff continue accepting ADU applications per City Council direction.

Is the old Huntington Beach ADU ordinance still in effect?

The city says HBZSO Section 230.10 is no longer in effect since state ADU and JADU laws took effect January 1, 2020.

Do I need a Coastal Development Permit for an ADU?

The city says development in the Coastal Zone may require one. Confirm with the Planning Division whether your lot is in the Coastal Zone.

What is the Huntington Beach pre-approved ADU plan?

It is a free one-story, detached 490 square foot plan offered under AB 1332 in three styles. The city does not allow modifications to it.

Can an old unpermitted ADU be legalized?

State law bars a city from denying a permit for an ADU or JADU built before January 1, 2020 over building code violations, unless the fix is needed for health and safety or the unit is substandard.

Who do I call about ADUs in Huntington Beach?

The Permit Center at (714) 536-5271 or permitcenter@surfcity-hb.org.

Can I sell a Huntington Beach house with an unpermitted ADU?

Yes, with disclosure. A cash buyer can purchase it as-is and price the risk into the offer.

Sources

• City of Huntington Beach: Accessory Dwelling Units (ADUs)
• City of Huntington Beach: Pre-Approved ADU Program brochure
• California HCD: Accessory Dwelling Unit Handbook (March 2026)

This guide is general information, not legal advice. Rules change; confirm requirements with the City of Huntington Beach.